-a-3a=-20

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Solution for -a-3a=-20 equation: 


Simplifying
-1a + -3a = -20

Combine like terms: -1a + -3a = -4a
-4a = -20

Solving
-4a = -20

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by '-4'.
a = 5

Simplifying
a = 5

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